+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Slip-ring and conventional dynamic hepatic CT: contrast material and timing considerations

Slip-ring and conventional dynamic hepatic CT: contrast material and timing considerations

Radiology 195(1): 1-8

The major conclusions and recommendations of this review of contrast material use are summarized as follows: 1. Our recommendations for routine administration of contrast material are summarized in the Table. 2. Patient factors, such as weight, and liver and cardiovascular disorders may be taken into account when the above recommendations are modified. 3. Unenhanced scanning should be performed selectively. It is unnecessary for routine examinations performed with modern scanners and good contrast material injection techniques. 4. Although conclusive evidence is lacking regarding efficacy, reduced doses of contrast material may be given to patients with an elevated serum creatinine level. A full dose of low-osmolar contrast material may be given to functionally anephric patients if otherwise medically appropriate. 5. Differences in enhancement patterns produced by low-osmolar contrast agents and by high-osmolar contrast agents are small. Choice of contrast material should be based on other factors. 6. The dose of low-osmolar contrast material may be lower than the dose of high-osmolar contrast material so the examination cost may be reduced. 7. Low-osmolar contrast material is not satisfactory to use with delayed iodine scanning. 8. With use of slip-ring scanners and either helical or incremented scanning and recommended techniques, scanning should begin by the end of the injection of contrast material for biphasic techniques and within about 5-15 seconds after the end of injection for monophasic techniques. 9. Section thicknesses no greater than 8 mm should be used for helical or nonhelical scanning. 10. With helical scanning, a 1:1 pitch is preferred with a thickness of 5-8 mm. Overlapping sections may be used selectively to help identify and characterize small lesions. 11. Multiple-pass scanning is helpful to identify hepatocellular carcinoma in cirrhotic livers. This technique may also prove helpful in other conditions. As with any new technology, considerable advantages have come with new challenges, which can be overcome by knowing underlying principles and by attending to detail. Although we have learned much over the past 15 years about proper performance of abdominal CT examinations, we have much yet to learn about the effects of such examinations on the improved health of our patients and on the economic costs to society of providing this form of health care. Opinions on techniques have converged recently, as summarized herein. Therefore, we hope that some centers will now redirect their CT research toward the profoundly difficult, timely, and important issues of examination appropriateness, the value of quality improvement programs, clinical outcomes, and cost-effectiveness.

(PDF emailed within 0-6 h: $19.90)

Accession: 033411743

Download citation: RISBibTeXText

PMID: 7892446

DOI: 10.1148/radiology.195.1.7892446

Related references

Evaluation of the postoperative meniscus of the knee: a study comparing conventional arthrography, conventional MR imaging, MR arthrography with iodinated contrast material, and MR arthrography with gadolinium-based contrast material. Skeletal Radiology 28(9): 508-514, 1999

Timing bolus dynamic contrast-enhanced (DCE) MRI assessment of hepatic perfusion: Initial experience. Journal of Magnetic Resonance Imaging 29(6): 1317-1322, 2009

Dynamic CT of hepatic masses with intravenous and intraarterial contrast material. Ajr. American Journal of Roentgenology 138(5): 847-852, 1982

Dynamic incremental CT: effect of volume and concentration of contrast material and patient weight on hepatic enhancement. Radiology 195(2): 353-357, 1995

Hepatic helical CT: effect of reduction of iodine dose of intravenous contrast material on hepatic contrast enhancement. Radiology 197(1): 89-93, 1995

Dynamic computed tomography of hepatic masses with intra venous and intra arterial contrast material. AJR (American Journal of Roentgenology) 138(5): 138(5): 847-852, 1982

A new method for measuring dynamic change of tracer distribution using dynamic single photon emission tomography with a slip-ring rotational gamma camera. Nuclear Medicine Communications 23(11): 1115-1121, 2002

Contrast and resolution considerations in keyhole MRI Application to dynamic studies of contrast media kinetics. Electro- & Magnetobiology 17(2): 323-331, July, 1998

Contrast and Resolution Considerations in Keyhole MFU: Application to Dynamic Studies of Contrast Media Kinetics. Electromagnetic Biology and Medicine 17(2): 323-331, 1998

Reduction of the radiation dose and the amount of contrast material in hepatic dynamic CT using low tube voltage and adaptive iterative dose reduction 3-dimensional. Medicine 97(34): E11857-E11857, 2018

Use of contrast material for spiral CT of the abdomen: comparison of hepatic enhancement and vascular attenuation for three different contrast media at two different delay times. Ajr. American Journal of Roentgenology 164(2): 327-331, 1995

Contrast between hypervascularized liver lesions and hepatic parenchyma: early dynamic PET versus contrast-enhanced CT. Annals of Nuclear Medicine 28(7): 664-668, 2015

Moderate versus high concentration of contrast material for aortic and hepatic enhancement and tumor-to-liver contrast at multi-detector row CT. Radiology 233(3): 682-688, 2004

Aortic and hepatic enhancement and tumor-to-liver contrast: analysis of the effect of different concentrations of contrast material at multi-detector row helical CT. Radiology 224(3): 757-763, 2002

Evaluation of hemodynamic imaging findings of hypervascular hepatocellular carcinoma: comparison between dynamic contrast-enhanced magnetic resonance imaging using radial volumetric imaging breath-hold examination with k-space-weighted image contrast reconstruction and dynamic computed tomography during hepatic arteriography. Japanese Journal of Radiology, 2018